Decent Slim Speaker to Go on/under iMac 21"

Hi All, I have an iMac 21" that I am using with Logic Pro, but would like some better stereo speakers that don't take up much room. I have a few different speakers, such as a HK Onyx, Ministry of Sound Audio-M, but they take up too much space.

I used to have a Logitech Z605 which sat on top of the NB, however I forgot to take it when I left my now ex-wife. It appears to be discontinued.
I have seen a Creative Air, however JB are Out of stock till July. HN are also out of stock.

The Bose Mini seems like a great unit, but outside of my budget (and I hear is discontinued).

So can anyone reccomend any speakers, that would suit, and are good value for money. Other than that maybe a small soundbar?