Well, I just bought a Portuguese floor corker, 59.48 grand total. Now my only question is, what corks are best.
With natural cork, you run the risk of Cork Taint.
Since you now have a floor corker, use only #9 cork. They are bigger (wider) than #7 and #8, and thus give a tighter seal.
Label Peelers says:
Bottling Corks. Natural corks to Aglica polymer and even synthetic corks for long term storage. This range of quality corks has something to meet the needs of everyone.
Below is listed the styles of corks we offer and their storage length so you can find the cork that suits your needs the best.
First Quality Corks - 1-2 Year Storage ($9.82/100)
Premium Quality Corks - 4-6 Year Storage ($15.60/100)
NomaCorks - 10+ Year Storage ($18.53/100)
Aglica Corks - 12-18 Month Storage ($14.95/100)
NomaCorks are synthetic, and have the least risk of cork taint.
IMHO, buy the best cork (other than the finest natural cork, which can be really expensive). The cost difference is negligible.
I use NomaCorks. I bought 1,000 for around $100, and split them with someone local. Since they are synthetic, I don't worry about them drying out while they sit waiting to be used. I will give them a short dunk in sanitizing solution prior to usage. Not for lubrication, but just in case, since the sterile bag they were in was opened.
However, there are threads about the Portuguese floor corker not playing nice with synthetic corks. Some of them leave a score in the cork. Buy a bag of 30 Nomacorc for $6, and see how it works in yours.
If you are really into natural cork, places like the following have various grades: First, Super, Extra, and Flor. With First being $53/100, and Flor being $102/100. Like I said, really expensive.
http://www.widgetco.com/natural-wine-corks
There was one place that sold "extras", which are corks imprinted with a winery's logo. Those were relatively inexpensive.
With natural cork, only buy what you can use within a few months. They dry out if not used promptly.