Wrt gloves, most pro-teams just get a more or less retail variant with custom embroidery (Team name, thumb badge), but you'll be hard pressed to find players with actual custom gloves (unless they still use old ones from overseas). Most local teams won't have official sales (my local team did, but just because they needed cash badly), but the EQMs will sell you plenty of used stuff for cheap. Plus players tend to sell quite a bit of gear after the season is over. And some major vendors (like HPS in Germany) started selling pro-returns of used gloves and goalie equipment as-well as over-stock "player-model" "pro-return" sticks.
So lots of beer-league players here have used pro-stock (especially sticks and skates!), but there isn't too much custom / interesting stuff out there. And I don't know if there would be sufficient demand for a private sellers market of custom items, since most players over here use whatever they can make work because its cheaper than retail.