I've always gotten the concealers and bases from professional beauty supply stores, but I'm sure they have it at regular retail beauty supply stores. I don't know what kind of stores you have in your area Jennifer, but you can always go to Joe Blasco's site for more info.
Joe Blasco has makeup schools in Hollywood & Orlando, which makes finding his line in stores easier for those in Los Angeles & Florida. But you can shop online! I can't personally vouch for his products, because I've never used them, but I know a lot of makeup artists who like his line. But then again, they were probably graduates of his school.
I'm not a Blasco grad, but I have used his stuff. But I will say that I only like the bases on people who need real heavy coverage or for camera shots. For everyday wear, it's such an unnatural look and feel to me. I do know a lot of people who love it, but I think there are much better products out there as far as everyday makeup.
I have used Joe Blasco's oil based foundations for several years. It is easy to use and blends well. I basically used this for photography makeup. It makes the face very flawless. I have never tried the concealers though. I now use MAC's full coverage foundation instead of Blasco's. I get the same coverage and flawless look. It is also more convenient to go to a MAC counter than to order online or through the mail.
i'm really interested in the special blue neutralizer. i've tried almost every concealer out there for my horrible blue/green shadows near my eyes. i tried ben nye's, which is theatrical makeup (i'm sure you know this line well, joy, maybe). i'm hoping his neutralizer works well. i just have to wait and get a credit card from someone.