Band saws are one of the best pieces of woodworking machinery to buy second hand for three good reasons. They are built much better and heavier than anything on the new market, they are cheap and they are also easy to repair if they ever go wrong. I've picked a selection that caught my eye which are currently available on E Bay.
Here is a fine old Multico band saw in great condition. It would make a great second band saw or ideal for a small workshop. You just need to check it is single phase.
This Startrite machine is a rarity, it's the more powerful 352 but in single phase (most are 3 phase). It is sturdy but still manageable with two strong men. Expect to pay a premium for this one http://www.ebay.co.uk/itm/STARTRITE-BANDSAW-Model-352-3-PHASE-/330949420834?pt=UK_BOI_Building_Materials_Supplies_Carpentry_Woodwork_ET&hash=item4d0e1f6722
|If you're looking for something a little heavier try this for size! A very old Wadkin which has had plywood guards added over the wheels (it would look much better without them as it was originally). The motor is currently 3 phase but you could run it off anything, single phase, water, steam! A fine old beast but not for the feint hearted!! http://www.ebay.co.uk/itm/WADKIN-DR-30-BANDSAW-/231011781712?pt=UK_Home_Garden_PowerTools_SM&hash=item35c9600c50|
Here's another one http://www.ebay.co.uk/itm/Bbs-20-mark-2-bandsaw-vintage-/121135812378?pt=UK_HG_DIY_Saws&hash=item1c3441cf1a