Okay, I know, almost five months later (but that's the time it usually takes to wear down my mum ;)).
I've been digging and digging to find a pair, and after a load of debating (mainly over whether to get Torch or Evolution, and which colour) I've gone for a more basic style, Slide 7105.
According to the heelypedia on heelytalk.com, it's a rarer style, and considering I've spent the past few months trying to find a pair, I'd say that estimate is true :p
Two reasons why I got this model: one, it's what's classed as a "stealth shoe" (meaning it's less noticable that it's actually a Heelys shoe) and two, it's rarer than Torch, so I'm more likely to find a Torch model when/if I want to move up to grind plates and vert ramps.
They should turn up sometime next week once credit has been cleared and they're sent in the mail, so wish me luck, and I'll let you know how I get on!