altho i realise this may be an old thread now......i picked all my tracker bits over the last 7 days via the internet (may 2011).
1x kangos (£11) uk ebay
1 x hamer viewer (£15) amazon usa
1 x t28 panel (£5) forbes photographic
1 x self timers inc box (£7) german ebay
1 x jobo minilux (£10) german ebay
1 x hama remote (30) usa ebay
1 x vivastar flashguns (£1) uk ebay
1 x pump widget - marrsattacks
items from maplins for connections (£20)
1 x matchbox psu boxes (99p) uk ebay
i even scored an original sl80 calculator from casio on ebay too
so apart from the pump widget i am very screen made accurate