To give you an indication of the prices, I have converted the US.Dollar price to Euro's ( € ), and British Pounds ( £ ),  # You must take into account additional costs such as Import duties, Taxes ( VAT ) and Shipping costs.

HTA 100 BT Hybrid Stereo Tube Amplifier with Bluetooth USB Aux in Sub Out 100 Watt - € 249,-  #  £ 210,-  #  $ 279,99            Power Output 2 x 50 Watt / 4 Ohm

the Dayton Audio APA 150 can deliver 2 x 75 Watt / 4 Ohm or 1 x 150 Watt / 8 Ohm when set to Bridge Mono Mode.                          Prices for this Amplifier - € 203,- / 406,- ( p.pair )   #  £ 171,-  #  $ 227,74  ( price Dayton Audio ).

APA 1200 DSP 1200 Watt Power Amplifier with Integrated Digital Signal Processing, Dual Channel Class d Power Amplifier with built in Audio Processor. Output Power 2 x 200 Watt / 8 Ohm - 2 x 240 Watt / 4 Ohm - 1160 Watt / 4 Ohm Bridged 

Prices for this Amplifier - € 799,-  #  £672,-  #  $ 899,99 ( price Dayton Audio ).

MA 1240a Multi Zone 12 Channel Amplifier - € 728,-  #  £ 613,-  #  $ 819,99 ( price Dayton Audio )

40 Watts per Channel rms 8 Ohm  #  80 Watts per Channel rms at 80 Ohm ( Bridged ).

for information about the Dayton Audio loudspeakers you have to check the website