I have the Sound Kick speaker PP linked to and I love it.

http://www.target.com/p/jbl-charge-portable-wireless-bluetooth-speaker-with-built-in-amplification-black-jblchargeshadow/-/A-15184876?reco=Rec|pdp|15184876|CategorySiloedViewCP|item_page.vertical_1&lnk=Rec|pdp|CategorySiloedViewCP|item_page.vertical_1

I got one of these for Christmas and I like it a lot.

I think this one is pretty good-- at 1/3 the price of the bose

http://www.target.com/p/soundfreaq-sound-kick-wireless-bluetooth-speaker-black-sfq-04/-/A-14101890

What do you consider affordable? This one is very popular and gets good reviews:
http://www.amazon.com/Bose-SoundLink-Bluetooth-Speaker-III/dp/B00HWSXVDG/ref=sr_1_1?ie=UTF8&qid=1402445612&sr=8-1&keywords=bose+soundlink

Thanks