I am not quite sure what you are asking. Do you mean where do you purchase one or what do you look for.
If you mean purchase one, then I suggest several of the airgun web sites. Competition biathlon rifles can be very expensive. An example is the Feinwerkbau model P75 Biathlon that cost around $2,500. Today most, not all, of the biathlon rifles use a PCP system (PreCharged Pneumatic) With the required support system this will add to the cost See the links below and when they open look for biathlon models made by Feinwerkbau, Air arms or Airforce. There are also others that you may want to examine.
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