I genuinely don't know if I am BU to be disappointed by this or if I'm being ott!
Found an armchair on fb marketplace that I really liked and was in my price range. I messaged seller, they said it was still available. Seller put me in touch with someone who would be able to deliver it (my car is tiny so needed it delivering) agreed a price with delivery company. I arranged to pop to sellers house in the morning to just check it over and then pay (then the delivery company would collect and deliver it to my house after)
Few minutes after arrangement all finalised, seller got back in touch saying someone had messaged them and wanted to collect it this evening so they were going to sell it to this other person. 
The advert did not say first come first served. AIBU to be really disappointed?!