I've found forums for playfields and for backglasses/translites, but nothing for ramps. This forum is for people looking to buy, sell or trade ramps. If you are looking to buy a ramp, post it here, but also post in the Freeplay40-ramps forum as he manufactures ramps for a given title if enough people are interested.
Freeplay40 works closely with Larry at Starship Fantasy
lrosent345 and Pinsider
JodyG so that they aren't working on the same titles.
Here are links to other groups for parts seekers here:
Repro Ramp manufacturers:
https://pinside.com/pinball/forum/topic/freeplay40-ramps/page/81#post-5700226
https://pinside.com/pinball/forum/topic/new-ramps-by-starship-fantasy
https://pinside.com/pinball/forum/topic/ramp-o-matic-ramp-thread
Manuals and schematics:
https://pinside.com/pinball/forum/topic/schematics-manuals-amp-flyers-swap-shop-#post-5915211
Playfields:
https://pinside.com/pinball/forum/topic/nos-playfields-you-havent-seen-and-i-havent-seen
Backglasses/Translites:
https://pinside.com/pinball/forum/topic/looking-for-backglass-and-translites-thread-buy-sell-trade
Playfield plastics:
https://pinside.com/pinball/forum/topic/trade-your-plastics
SS Heads and Cabinets needed/Heads and cabinets available:
https://pinside.com/pinball/forum/topic/ss-heads-and-cabinets-needed-heads-and-cabinets-available#post-5953346
EM heads needed/EM heads available:
https://pinside.com/pinball/forum/topic/em-heads-needed-heads-available
EM parts needed:
https://pinside.com/pinball/forum/topic/the-em-seeking-parts-thread/page/126#post-5623814
If you like working on project pins, check this forum:
https://pinside.com/pinball/forum/topic/post-project-pins-for-sale-here-cl-ebay-pinside-and-others
Apron decals:
https://pinside.com/pinball/forum/topic/apron-decal-options#post-6648867