Morning bumpdiddly iddly!
FYI:
imp a105 and a106 have the same eco and damage, difference is imp a105 lasts 7219 uses and a106 lasts 2006 uses. So even if you have 3 a106 amps, the imp 105 lasts longer and you don't have to keep changing amp.
Last time I checked the a106 went for around...