Seeking lower cost alternatives to Berkeley Audio Design Alpha USB converter


I am looking for a USB to optical audio converter.
The Alpha USB from Berkeley Audio Design is an external asynchronous USB to S/PDIF (or AES) interface. It's strictly a D to D converter accepting USB digital audio input and delivering digital audio output.
That's the type of product I'm looking for. However, at $1,895 the Berkeley Alpha USB is far more expensive than most similar products I've seen. Some of these products sell for less than $100.

I'm on a budget. Can anyone recommend one of the lower priced alternatives to the Alpha USB from Berkeley Audio Design?
lowoverdrive
@fuzztone - thanks. I just ordered that. At that price I had to give it a try. Have you used it (or know anyone who has)?
@bk12 - I ordered the Matrix X-SPDIF 2 as well. I'll give both a try.
@jgoldrick - as luck would have it, I just found a mint condition Singxer KTE SU-1 "Kitsune Tuned Edition" at a good price.
I have had good success with the Matrix Audio SPDIF. Thumbs up for build quality, SQ and value

good luck