I always get mine from crazy wire co. You can buy from their website or they have an ebay account. For the doggy I would recommend 30awg ss316L or ni80.
http://www.wireandstuff.co.uk/produ...Steel---0.25mm--250-Micron---30-AWG--250.html
£1.50, can’t really go wrong!
I think some people find 28awg easier to use, I find the 30 easier to be honest, and find it works better as well. Ni80 is maybe a bit easier to wrap as it’s less springy. It’s good, has higher resistance that the 316l so you need less wraps. It’s personal preference really. You could get a roll of both and see what you prefer.
I’ve been building for a year and a bit and have never had a coil jig. All you really
need is a drill bit or a wee screwdriver to wrap on. Wire snips are handy, I blunted a pair of scissors before I bothered getting some...!