The interest to explore many-positron systems requires new generations of more intense positron beams. A number of limitations preclude the use of long-lived beta-decaying sources for this purpose. Positron-electron pair creation from bremsstrahlung or short-lived radio-isotopes must be produced on-site. Powerful linear accelerators or nuclear reactors are prime choices but are in high demand and not available on an as-needed basis. The use of smaller laboratory-sized accelerators is presented. They can be a much needed step in developing new ideas. Driven by the needs of medical and industrial applications, these machines have become reliable and are relatively easy to operate even by small research groups such as the one at WSU. The current situation is briefly reviewed and experiences with one system in particular are discussed.