OctoInkjet : http://www.octoinkjet.co.uk
...or...
OctoInkjet on Ebay : http://stores.ebay.co.uk/OctoInkjet
You have a choice of kits:
- [WIB] Waste ink Bags "Solo" and "Duo" for single (eg: R300) and double (eg: R2400) tubed printers
- [WIBB] Waste Ink Bags in a Box (as above but with a liquid proof container to hold the bag)
Ebay is more expensive because of the high listing and final valuation fee although obviously if you just prefer the protection it offers buyers that's fine.
Of course, there are other kits available on the web and provided on some of the instructions we've linked to. There's also nothing stopping you from using the instructions to create your own waste ink receptacle so just take note of the tips and you should be fine.
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680