If you just want to build your collections, have a "speaker" from a orchid nursery come to your meeting and bring plants to sell after the speech/meeting.
I'm also wondering if you have speakers for your meetings. Our speakers often supply the raffle table and bring even more plants to sell individually. Expert members supply when the speaker can't, or we have a "bag raffle", in which each member buys a $10 dollar ticket and is guaranteed one bag, which has an orchid inside. The exact orchid is a surprise. These are the ones that we have gotten from Exotic Orchids of Maui.