Ka sat lnb used to be available everywhere, but somehow it is not that easy to find `em now. Anyway here is the
seller you can buy the lnb from. Shipping to Bulgaria is also available, just add "Europe" and then write Bulgaria and there you go - "3-5 Working Days - €15.00". Total price to pay would be €54.12.
(Or
here if you prefer it from UK)
The second LNB you`re interested in was sold by Ponny who unforunately passed away in May 2017 and from that moment on this LNB is not available anymore. But during the time Ponny had it "in stock" there was another seller located in UK, but the price was almost double of the Ponny`s as far I can remember. I don`t remember what eshop it was and I can`t find it right now even I have been googling for half an hour.
In general speaking, everybody bought 2-3 pieces that are/will be in use at some point and I don`t think it will be sold to you by a hard core DXer. It was mostly hard core DXers who put orders for that lnb. Well, it may happen at some point.....
The good thing is, that there are other LNBs available. In different price range of course, but if you really, really want to enter this band, there is a way to do it. I can only name the well know manufacturers such as XMW, Norsat or SMW.
If it comes to Astra 4A @ 4.9E and MBC channel from Malawi, forget it. We (me and Peon) have tried to get it on the professional NWIEE 3.7m PF dish in Michalovce, Slovakia and there was absolutely nothing on spectrum at all. Not even a wee spike!