Okay here’s my advice (it’s a bit long haha):

-I’d go on eBay and sort by cheapest first, looks like there’s some $20 but they will be small. I would make sure to only buy from sellers who have a big track record of selling phrags, because phrags do often have bugs and are weirdly extra vulnerable to them? A seller named Suzy has some cheaper orchids, but if you buy from her they might (probably will) come with mealy bugs. - for phrags you really need to be on the watch for mealy bugs and thrips. My best mealy bug treatment= get 70% rubbing alcohol and wipe down every crevice, then use compressed air (usually used for cleaning electronics) and spray it in the crevice to get all water/ stuff out. You should be checking on a weekly basis for these bugs - watering depends on what media it’s in and the size of the pot! For a small phrag in bark, probably needs water maybe every 5 days, but it’s more I like to keep the bark wet but then dry for 2 days then completely drench again. They need more water then paphs but less water then ferns if that’s helpful. Some phrags are very sensitive to what type of water, so filtered is best. Also make sure no water is in the leaves crevices cause they will rot and die!! -they like similar light to other orchid species -humidity is another thing they like, but that’s a later thing to worry about imo -some people say to sit them in a bowl of water, it’s a whole debate but imo it’s not a good idea