What's the best/cheapest windows phone with expandable storage?

[Windows Central Question]

I'm looking for a Windows Phone to use exclusively as a media player. I know only certain devices have expandable storage, and I would like one I can put a pretty beefy microSD card into. What's the best/cheapest windows phone with expandable storage? Also, I plan on buying used.

 

[weaksauce27]

Nokia Lumia 520/521 I've seen some on Craigslist from $20-50

 

[RumoredNow]

^^^ Nailed it in one ^^^

But best and cheapest are most definitely 2 separate things. LOL

 

[xandros9]

Best with SD? 1520 and if it got more support, the ATIV SE. EDIT: woops forgot the One M8!

Cheapest with SD? The 530, although the 520/521 can be found for less (and its a better phone)
Buuut if you can find a good deal, the 620, 720, 820 has SD slots. (the 920 and variants, 1020 don't for sure)
Heck, Samsung ATIVs have them usually

In between? Everything else. (except the ones without a slot of course.