ped
The domestic ones are better for cooked meats - in my experience, they don't do bacon well!
I've bought all of mine from Ebay, but it's caveat emptor - buyer beware.
The smaller domestic machines
will cut meat, if it's cut to the right length and nearly frozen, but in my experience it was a real pain.
It's probably the best time to 'buy well' and 'buy once', so my advice would be to buy a decent commercial one. The most expensive I've bought was only £150 - it's a Berkel with full 'CE' marking etc so could be used commercially and was bought on Ebay..
My advice would be not to rush. Things sell on Ebay in 'phases'. One minute they're selling like hot cakes for 'top dollar' and the next week people can't sell them 'for love nor money'. Set Ebay so that it advises you when second-hand Berkel, Hobart, Bizerbera and other quality slicers come online and you'll eventually get a good one. Set your maximum and never go above it; maybe be prepared to travel to collect but remember that this will add to the cost. Eventually, you'll get a bargain.
That's my 'two-pennyworth' anyway.
Phil
added:
I'll be interested to see how much this makes:
http://www.ebay.co.uk/itm/130829161003
P