amps are usually considered 1ml single use glass with a snap off top. vials are usually 10ml and are multi use.
$25 seems low for a 10 ml vial but way too high for a 1ml amp.
the amount you need is determined by the dose you decide to take. im going to assume your going to take 100mg every other day for 12 weeks and your stuff is dosed at 100mg/ml. if thats the case you will need:42 ml (x5 10 ml bottles, or x42 1 ml amps)
couple questions I want to ask, are you a newbie? if so why testosterone
prop?