'Clearprint' is about the only brand of drafting grade vellum available in my area and I have used it forever. Comes in rolls of a variety of sizes as well as tablets, both gridded and non-gridded.

I no longer blueprint anything, as oversize copiers are so readily available, far less expensive and not nearly as aromatic. My local Kinko's can print upto a 36" width, your choice as to the second dimension. I once saw a guy copy a 100' long railroad easement site plant on one of these puppies!

Depending on where you are, blueprinting may be more trouble than it's worth. We actually own an old blueliner, but we've stopped using it because it took me two days on the internet and on the phone to find a reasonable price on high-speed blueline diazo paper. I miss the warmth of the paper a little, but I feel like my renderings "pop" much more on presentation bond- and no ammonia smell!

Dave

I also love the look of a blueprint.(It also makes the drawings look better!) I purchased a used machine at a great price from a local architectural supply company (and see them from time to time in the newspaper classifieds...check with local engineering companies who may still have one gathering dust in a back office.) It's wonderful to have it in the office and not have to run across town every time I need a print.
I get all my supplies from DATAPRINT...a mail order office supply company. They have many sizes of vellum (even have available custom title blocks) and print paper. It arrives by UPS within a day or two. They also sell new blueprint machines and associated supplies and products.

I'm going from memory here because i'm not in my office, but I use 18 x 24 sheets of pre-blocked vellum from the Helix company. I slide 1/4" grid graph paper underneath for my scale. I get this paper in the drafting section of office-supply stores. Before handing it off to the client or the installer i make a copy of it at Kinko's for about $2.50.