There's also a matter of your objectives. Some have an objective of length rather than bulk- they are looking for low-hangers, as well as penile and/or foreskin extension. These pumpers may use a smaller combination cylinder, which causes the temporary enlargement (and the stretching of tissue) to be more in length and less in girth. We make a cylinder for this purpose, called a LongJohnny. Taking the same objective to the ultimate is PumpToys' special contoured cylinder that adds shaping to the process, called a BullMaster.
Combination cylinders start at around $80, with quality products starting at $100 and up to as high as $300. However, there is the Sun Tea Jar option, that has been used by thousands as a way to try it without spending a lot. It's also called an STJ, and can be put together for $10 at the bare minimum, or nicely for about $40. There is an article in the library that explains how an STJ cylinder is set up. See "The basic STJ- making your own". We also make an STJ Conversion Kit which doesn't require any materials or special skills to use.
Pumps come in a variety of forms. Many beginners have used only oral suction. While that's more than adequate in power, it's a nuisance. It also introduces oral bacteria to the tubing, which if not cleaned regularly can create a breeding ground and a risk of it's own. Again, common sense and reasonable hygiene eliminate such problems.
The simplest mechanical pumps look like a small bicycle pump, except the valves are reversed. This type of pump is available in adult stores (usually of poor quality) and from pumping specialty houses. Straight-line hand pumps vary from about $15-$60.
Another very suitable pump is available in automotive parts stores, under the name Mityvac. It's designed as a tool to do vacuum testing and brake system bleeding, and comes with a gauge and release valve. It's a one-hand operated (squeeze-grip) pump, constructed of very durable plastic. There is also a Mityvac constructed of metal, called the Silver-line Mityvac. PumpToys sells both models.
The up-scale end is comprised of electric pumps. This adds complication to the process, as you are tied to an outlet. It also means you want to be especially careful, to be sure that the device can't possibly short out- particularly if you wet-pump. Basic electric pumps vary from $100-$350.
Got a question we didn't answer? Check our library for more assistance, or- ask The Bagman!