WTB: Solid Pieces of Aluminum (~1/4 inch thick)

I'm not too picky on exactly the specs, nor whether this is raw aluminum or repurposed from elsewhere, but I'm looking for a piece of aluminum, perhaps 1/1 to 1 cm thick, and probably 6x8 cm width/height.

I'm going to be building a tent light using LED emitter plates. The plates will be attached to this aluminum base, heatsinks will be attached to the opposite side, and the whole unit will hang at the tip of the tent, with the batteries and driver circuitry elsewhere (probably on the floor for easy control).

Anyway, if I had a machine shop, I'm sure I'd be able to just cut my own, but since I don't, I'm looking for an alternative. Can anyone point me somewhere appropriate?

The best option I could find was this:
aluminum, block, bar, 3/4" x 3-1/2" x cut to size | eBay
But it's a bit thicker, and not exactly what I was looking for.

PM me exactly what you need. I've got an automatic band saw or I can stick them in a lathe and part each piece off for a smoother finish.

That's amazing. Let me get precise measurements, and I'll PM you this evening

I can't remember if I actually PM'd you or not.

- But, what I'm looking for is a roughly 110 to 120 mm square piece of aluminum, probably 1/2 CM thick, but thinner or thicker is ok for my application.