[Lowfer] Looking for small BalUn, 50 Ohm to 100 Ohm.

[KD7JYK DM09]

I'm working on a dedicated single frequency 660 KHz antenna for my 
wife.  Receive only.  I have the antenna, mount, and matching network 
figured out, BUT, the receiver has a 100 Ohm input, and all of my 
equipment is 50 Ohm, making it hard to sweep the network, and match up 
the antenna for best reception, and I'd like to do better than tune for 
maximum noise, if possible.

I've scoured the web on, and off for about three months, and I've only 
been finding kiloWatt baluns for $$$ and out of the country.

Seems to me there must be a QRP source state-side.

I've tried rolling my own, and toroids and I don't get along.  I could 
no doubt learn, but I'd rather not have this project pushed to the back 
burner for more years to come, so I'm looking for "plug and play", 
either something small, in a box with connectors, or something I can put 
in a box with my own.

Any sources for a 50:100 Ohm, or vice-versa balun at reasonable cost 
(~$30 delivered, $50 + shipping seems steep for just one sweep) in the US?

Thanks.

Kurt