If you are ok with used speakers why not do a zip code search on eBay and Craigslist using the generic term " Speakers " and see what you find ,you could also create threads on any forums you belong to where you give out your zip code or city and ask members if they have any unused speakers they'd be willing to part with for your budgeted price range .
A year or 2 ago I saw a thread on the Emotiva forums by a kid trying to find a reasonably priced DAC for $100 or less ,he lived in my state so I posted that I would GIVE him an unused Emotiva DAC ,when he showed up to pick up his free DAC he asked if I would show him my system as he had never seen an entire McIntosh system ,so I showed him & spent a few minutes talking to him ,found out he was a nice kid ,when we went into my garage to get the DAC out of the attic I used the beat up Klipsch Lascalas in my garage as a step stool & he mentioned how he would love to one day own a pair of Lascalas ,damn things we're in my way so I gave them to him too ,he came back the following weekend with a friend and a truck & got those things out of my way ,they were cosmetically beat down but mechanically sound , I think you'll find there are alot of us with extra gear laying around ,stuffed in closets and attics or garages that's cosmetically not fit to sell but is light years above what you can buy new , just yesterday on the Emotiva forums a member gave away 3 sets of quality cans he had laying around ,I'm not a headphone kinda guy so I didn't take a pair but 3 other members did ,don't be in a rush ,$350 is still alot of money ,do some searches and post some threads ,after all your not asking for charity ,you have money to spend .