The same thing has happened to us... Start out with one tank because we keep our herd around 50 cows..buy a cane, use 5 straws, then have them left over. The next year you buy a cane of another bull, use 7, and have 3 left. Pretty soon the tank gets hard to pull the straws out when breeding. Did I mention that you'll decide to FLUSH your best cow or buy embryos from someone else, and those will be in your tank too.And if you're like me, lots of them. (Anyone want to buy some embryos..I have 110 in the tank now). After 20 years, we have 3 tanks, two that hold 720 straws and one that holds 2100. Accelerated Genetics has a sale on tanks in the spring. I bought a new one last year. I found them to be the least money..same tanks as ABS. ABS will sell tanks in the fall that people rent for the summer, but you need to watch them since some come back kinda beat up, but they have a full guarantee. Genex has a spring sale as well, pretty close to Accerated's prices.