I paid 176 for my DJM from pc nation. brand new in box.
dj-techs dif 1s is okay for learning how to scratch. but for mixing, i do not know. no eq kills or filters, etc.. better look into something else if you will just mix. 
xone 22 is great
ecler nuos are great
pioneer 250 looks good, haven’t used one but heard good things
reloop rmx 20 is a decent mixer at a decent price