I have the NS-10G. The Nobsound mini appears to be the same thing without the EQ button (which is rubbish anyway). The reason I suggested you buy a 100W power supply separately is because the one that is bundled with the amp on amazon isn't powerful enough and overheats (dangerously). I bought a 12V 8A psu on ebay (12 x 8 = 96W) and that works perfectly.
Thanks Croquetes and Mark_Moorby I'll mainly use speakers with a bluetooth audio source(mobile or fire stick) and want to have a budget solution. Mark kindly suggest the nobsound model numbers. Is it mandatory to have separate power supply for nobsound?
If you want something very cheap that works just fine you can get a nobsound 100W amplifier for around £30 (I'd recommend buying the amp and 100W power supply separately on ebay). I got one the other day, it's got Bluetooth, aux in and USB in. There's a very slight hiss that comes out the speakers so it's not perfect but other than that the sound quality is very good (you don't hear the quiet hiss when music is playing) If you're looking for a more expensive amp I know the Marantz pm6006 is good for something like this (no Bluetooth without buying an adapter for the aux jack). My friend has one of those but then you're looking at several hundred pounds.
Are you going to use them with a TV? If so, get an av receiver (any will do but reputable brands are Marantz, Denon, Cambridge, Pioneer), I've got a Onkyo TX-L50 to save space (7mm of height to fit on a tv unit ) If you don't need to connect them to a TV just get an HiFi Amplifier, they are cheaper
Please suggest amplifier for home use. I am very new to such kin of speakers. I have always used PC speaker which comes with inbuilt amplifier