I ordered a bunch of those disposable traps from Amazon (just got to make sure you order the West of the Rockies version in this area!). Our local stores were out too! I've lost count of how many of those traps we've filled. A friend of mine (who is much braver than I!
) emptied out one of those disposable traps, added some additional attractant and water, and stapled it closed to reuse it. Said it worked great. She also suggested getting one of those BIG fly traps and putting the attractant in it. I'll bet you can find just the attractant more easily than the actual traps.