Large Print Keyboard Overlays for Vision Impaired Users
Personally, I'm a little gun shy over the above models and their competitors. There seem to be a lot of complaints about their quality and durability. This is natural for anything technological, but it's still a little worrisome.
I think that the option for large print stickers is the best choice. These are just stickers that can be put onto the various keys and they do the same thing as the large print keyboards. The benefit is that you can use a trusted name brand keyboard, or just continue to use the keyboard that you already have. This seems to be a safer option.
The four pack ($15 after shipping) seems to be a good deal. You can find it through this link. They have four sheets of stickers with yellow on black, black on yellow, white on black and black on white. This means that you have three sets of backup stickers to use before you have to buy more, if the adhesive wears off. There are also some interesting ideas for using different colors to color code the keyboard. For example, one color could mark the letters while another would handle the numbers and a third would handle formatting keys.
Unfortunately, it really seems like there is a tremendous deficiency in Braille keyboards for any blind users. I had trouble finding legitimate brands for home use, although I was in luck with the sticker producers. Keys-U-See offers a large font overlay that also has Braille markings. You can see it through this link.