I originally chose to order from Lenstore a year or two ago as they were the cheapest supplier I could find online. I went on using them as they are easy to deal with and the lenses arrive quickly. No problems at all so far.
I ordered a Roper Rhodes cistern for my new bathroom as Tapsbiz price was the cheapest. It arrived within a day or two with no hassle, which is what you want. (I have not been so lucky with other firms I ordered items from.)