Prints seen on display might be on traditional photo paper (normally stated as 'C-type'), but they can also be available to order using an inkjet / giclée process with pigment inks on heavier, acid-free papers (typically by Hahnemühle).
A workable size for most images is 15½ x 10¼" / 383 x 260mm, which on 16" x 12" paper will have a slim white border all round - for framing, this border's normally overlapped by the surrounding mount, which in turn will fit easily, if wanted, into a standard 500 x 400mm frame (the images on the left illustrate the principle).
Any discussion about different print sizes should be on an image-by-image basis.
An inkjet / giclée print sized as above, supplied unmounted for you to arrange your own mounting & framing locally (this simplifies postage), is currently £65, plus £5 postage within UK.
Having clicked on an image on the Portfolio page to enlarge it, note its title and number. Email me to discuss it further, or just quote those references for a print and I'll reply with confirmation and a Paypal link - you can pay me securely by this method.
For collection only I can discuss supplying a print both mounted and framed, with the possible option of a hand-made hardwood frame.