These are quite good (well a bargain really) for $5.

Mitre10 multi function pen

Thanks robjg63: What with the built-in ballpoint pen, ruler, level and screwdrivers, that stylus looks to be a little overkill for me :-). I've ordered a couple of $2.00 models; it'll be interesting to see if they work.

Heads-up: Bought a couple of these $1.99 styluses on Trade Me:

https://www.trademe.co.nz/a/search?search_string=3799642965

They're anodized aluminum, very thin and light, 150mm x 6mm dia. and they work fine.