Bureau Of Engraving Question

I was thinking of buying a few things from the Bureau of Engraving. I was trying to do a little reseach to see if there was any markup on the products they sellout of, however I do not see anything on ebay to use as a gauge. Seems like some of the stuff they sell is very exspensive. Some of the things they sell is a limited edition set--only 2,000 or 50,000 worldwide will be produced. Seems like something like that might be good to add to the collection and as good investment in the future if you can be the first in line to get one. I guess my question is, Has any of you bought from here for an investment? Is there a book that has the products they sell, such as the " Red Book" ?

Thanks, Tim