If you decide to rent locally, your best bet for rental gear will be with Scubaland on 620. Great people and quality gear. There is also Dive World on 620 but there have been posts that indicate there are some "issues" with their rental gear. Both shops are within 15 minutes (real traffic minutes) of Windy Point and for my money, go with Scubaland. There is a fill station at Windy Point but no tank rentals.
Your choice of wetsuit depends on how well you tolerate the cold. Personally, I would think a full suit is in order.
Regarding a swap meet, there hasn't been one in the past. I would post what you are looking for and see what the other Swampers have in their closets.