I've got two at the moment, and that's taken some restraint. For some reason, I've gotten in to these little speakers, and any time I'm out it seems like I've found another one I'd like to have.
First is a Monster Clarity HD. I think its been discontinued, but you can still find it around for about 50 bucks. Works great, pairs easy. Its not going to blast you with sound (it fits in the palm of your hand), but its great for listening at your desk, on the porch/deck, that sort of thing. The sound is incredibly clear. I use it when having a drink on the deck, in my office, etc.
The other is the Ecoxgear Ecoxbt. My wife got it for me at Christmas (I think on sale around $60) but you can find them anytime for about $90. I LOVE that speaker. Sounds perfectly fine for what I'm listening too. Battery outlasts me, no issues pairing. Its waterproof and well protected...mine's had a rough life and barely shows a scratch. Damn thing will float. I've used it as a shower radio, had it all over the lake, took it to the beach, etc. The shape makes it easy to strap to/hang on to/tie down on anything (I've done backpacks, coolers, tailgate, Kawasaki Mule, golf cart, etc). I use it constantly. Can't say enough good about it.
Grace Digital Ecoxgear Ecoxbt Bluetooth speaker review - CNET
Best friend has a Soundfreq SQF-04 Sound-Kick. We listen to it when we smoke cigars at his house. Great sound, better bass than either of my smaller/more portable speakers. I think they're around $90-100.
There are tons of great options out there. Its amazing what you can get for less than $125 right now. Even some of the $25-30 options are really good.