Where can I buy good quality iPhone screens and colour conversions?

I need to find a trustworthy supplier for all types of iPhone screens. All screens must be good quality, have an LCD and touch digitiser pre-assembled and fit GSM versions of the iPhones. Prices must range from £20 for 1 screen or £30 for the full housing. I need a supplier that can deliver quickly in the UK and guarantee my satisfaction. Thanks a thousand times to anyone that can give me a good answer because I've searched for countless hours and all I can find are Chinese con artists.

Amazon

Two sources and reliable ones too

1. Ebay

2. Amazon

Hope this helps you.