Budget Powered Subwoofer Recommendations

[KasterUK]

This year I purchased the Denon RCD-M41DAB micro-system, which I can highly recommend for anyone working to a budget.
However, Denon do not make a subwoofer to pair with it.

Any recommendations for a decent one that won't break the bank? The subwoofer must be powered.
Thanks in advance.
KasterUK

 

[Deleted member 116933]

Bk Gemini though depends on your definition of breaking the bank