Five days before I was to depart for La Paz and the
Sea of Cortez, I washed my wet suit and left it in the sun
to dry. My dog Petey chewed off part of the zipper.
It’s not easy finding overnight wet suit repair, but
  I found Diane Berkheimer and Blown Out Wetsuit
  Repairs in Santa Cruz. I called Tuesday afternoon; she
  said to overnight it and I’d get it back Friday morning.
  It sounded like a $20 repair, plus shipping. Away
  it went, and the next day she called to say the zipper
  needed replacement — an extra $20 (plus the overnight
  return fee) — but she could still get it to me the
  next day. She was true to her word and I went diving
  warm.  
Take your suit to a local dive shop and it goes on a
  2-3 week journey. But there are folks who can help you
  in a pinch. Using an overnight service — and paying
  a premium to expedite the return — you can get your
repaired suit back two or three days after you send it. 
Even new suits can sometimes be “customized” with
  minor alterations. You can cut down an oversized wet
  suit, but what about that persistent “shrinking” problem
  we often notice when we first struggle into our suits
  after a long layoff? Neoprene air cells collapse because
  of aging, making suits stiffer and harder to don, and
  some shops discourage enlarging too-tight suits. With
  nearly all wet suits being fabricated offshore, matching
  rubber and linings can be difficult (especially for proprietary
  materials such as Henderson’s Hyperstretch®).
  And don’t expect overnight treatment for a substantial
  alternation unless you can offer big bucks, and even
that may not be enough. 
Diane of Blown Out Wetsuit Repairs works on suits
  no thicker than 5mm and farms out larger jobs to the
  popular and well-regarded Cricket Justice, who runs
  Otter Bay Wet Suits in Monterrey, CA. Cricket can
  handle all repairs and alterations “within reason” for
  most suits on the market. She too could have handled
  the quick repair I needed in October. As an example
  of their rates, they charge $55 to replace a wet suit top
  zipper, $325 for a drysuit zipper. The charge may differ
  from the quote once they inspect the suit.
Sea Me Repair in San Diego is a popular facility recommended  recommended,
along with three other Southern California
facilities, on the Divers Discount website (diversdiscount.
com/resources/repair_info.asp). The site also
lists links to manufacturers that accept repairs, including
Bare, Body Glove, Harvey’s, Henderson, O’Neill,
and Parkway, among others.
Sea Me proprietor Karen Gray says pockets, zippers,
  relief zippers, and hole repairs are common assignments.
  (She says many wet suit holes are caused by divers
  sitting on boat cleats.) She charges $19.50 to replace
  a zipper slider, $45 for a new zipper; body modifications
  go for $60-$150, and she’ll tell you if it more cost effective
to buy a new suit.
 The folks at Stitchlines (Englewood, CO) told us
  rush work is double the charge. “We work on a first
  come first serve basis. I do understand last minutes do
  happen; however, their urgency is not my emergency.”
  That said, I’d suggest trying others first. Superior
  Diving Repair in Brainerd, MN, offers “rush” service for
  $50. Terrapin Wetsuits (New Braunfels, TX) offers 48-
  hour turnaround time for $20 extra and 24-hour turnaround
  time for $30. Rush jobs are anything less than
  two weeks at Diver’s Cove in Essex, CA. Cost is $50.
Below, we’ve listed outfits that provide overnight wet
  suit repair. Be explicit; ask how much more you need to
  pay to guarantee a return when you need it. If the shop
  can’t meet your deadline or is uncertain, keep looking.
  And don’t send a damp wet suit.
 – Ben Davison 
Blown Out Wetsuit Repair
  3055 Portola Drive
  Santa Cruz, CA 95062
  831-475-4942  
Diver’s Cove & Sea Wolf II
  7 Essex Plaza
  Essex, CT 06426
  1- 860-767-1960
  www.diverscove.com 
Superior Diving Repair, Inc.
  712 Washington St.
  Brainerd, MN 56401
  1-218-825-7009
  www.drysuitrepair.com  
Sea Me Repair
  4352 Poplar Street
  San Diego, CA
1-619 563-9033 
Stitchlines
  3750 S. Broadway
  Englewood, CO 80113
  1-303-781-9044
  www.stitchlines.com 
Terrapin Wet Suits
  1268 Ponderosa Dr.
  New Braunfels, TX 78132
  1-830-226-5194
  chris@terrapinsuits.com 
Otter Bay Wetsuits
  207 Hoffman Ave
  Monterey, CA 93940
  1-888-220-1453
  www.otterbaysuits.com/repairs.cfm