There are several places you can get the splav stuff, Redsoldier is the best in my opinion and our team gets most of our gear there. My 2TL has a Splav vest that uses modular pouches that resembles the M23.
Lately, Redsoldier is carrying fewer and fewer items so we have been looking for other sites to buy from. If you specifically want Russian gear, you can check:
Russianarmysurplus.com
Sovietarmystuff.com
Redforces.com
Also, there are several stores on ebay that have very good customer service and high positive feedback:
Russian Camoflauge and Gear
USSR Online
Soviet Army Stuff
These are what I can come up with off the top of my head, with a little more searching I think I can come up with a few more.
Do you come out to the local games here in GP?