Specific differences in electronics for similar spec 12V power adapter/suppy?
I would advice against LED-specific supplies since they are often constant current type. Another specialized type to avoid is one for battery charging. Check eBay for a replacement supply for your particular equipment; the supply could be generic but they often put a list of compatible equipment in the description.

The price is not very good indicator these days. Granted, for $70 you'll get a supply that is much less likely to give you grief. On the other hand, if you buy 3x$20 supplies from different places,  two of them will be the same quality as the $70 one - and you save $10 :-).