There is hardly enough info provided to suggest much.
Is your mixing console a digital mixer or analog?
Are you using a stand alone all in one recording thing like the newer Yamaha units, or a Roland VS unit, or something like that?
Do you have a usable computer?
When I mix with an analog console, I use my computer as the mix down "deck". I like this because I can then edit, or generally manipulate the "mixes" in an editing software like Wavelab and "master" a CD on the computer. A good sound card that does 24 bit and a good CD burner for your computer can be had for as cheap as $300 (folks, before you go saying you can get this and that for this and that much, I said "GOOD" stuff....not some cheap ass SB wannabe card, and a CDR burner that actually burns good disks. Not all soundcards and CDR burners are created equal, not by a LONG SHOT!!!).
So, there are many options, but to know the "cheapest" route, I would have to know HOW you are mixing, and what kinds of outputs you have from your mixer to make any MEANINGFUL suggestions.
But these guys got their post counts up a bit...
Ed