Prices? Amazon don't seem to have an option in the UK, the only other options are either Flas dependent or full of junk sex ads.
Photo bucket is one, but it has all the iffy ads....guess I will have to stick with Flickr for now unless anyone in the UK knows differently.
Photobucket seems to be buggy for the Photo of the Day posters who use it. Sometimes the main photo just doesn't show and they have to post a thumbnail from the MR server to make sure something shows. It doesn't sound like a great place to keep your photos. 500px.com is something to check out. I don't use it, but some of the top tier photographers on the forum do and they like it.
My question is why you want to upload large file sizes to the Net and what "large" is to you. My flickr uploads are 1200X800 and the file sizes are around 6 MB. I set them to 300 dpi if I upload from PhotoShop, but keep the physical size small. If they come out of Aperture, then the dpi is set to to 96. Someone could print a postcard from them but a large print would not have very good detail so I don't worry about anyone making money off my public work.
If what you are looking for is remote storage for a photo backup, I would just go with a portable HD that you toss in your pocket when you leave your main computer. If you just want to do photo sharing, then you don't need large file sizes.
I have a Flickr Pro account. It costs me $25 per year for unlimited uploads.
Dale