Here's what I pay direct from a local breeder:

Mice
Pinkies .35
fuzzies .50
hoppers .60
small adult .75
medium adult .85
large adult 1.00

Soft Furs
Small 1.00
Med. 1.50
Large 2.00 (same size as a small rat)

Rat
Pinkies .65
fuzzies .85
weanlings .95
small 1.50
med 2.00
large 3.00 (these are really big, they keep my 6' BCI fed)