Where to buy a OK4U-100 grid tie inverter?

Anyone know where to buy a OK4U-100 grid tie inverter? Or is there something else out there I should be looking at? I have a Harbor Frieght 45 watt set and I'm looking to grid tie it to slow down the movement of the meter a little bit. In the future I will probably get another HF 45 watt set. Is there anything else out there besides the OK4U-100 for small systems?

WhyMe wrote:

Anyone know where to buy a OK4U-100 grid tie inverter?

Unfortunately, they don't meet UL-1741(?), and are not legal for sale in the US.

Or is there something else out there I should be looking at?

Due to the costs of certifying an inverter for Grid-Tie, there are no small grid-tie inverters out there. A 100W inverter would cost nearly as much as a 1KW inverter, so no-one has spent the money to certify a cheap inverter.

William P.N. Smith wrote:

Due to the costs of certifying an inverter for Grid-Tie, there are no small grid-tie inverters out there. A 100W inverter would cost nearly as much as a 1KW inverter, so no-one has spent the money to certify a cheap inverter.

I'm not sure certification cost is the issue. That part might be $25K. We would want to use UL parts, and build more than one :-)
Nick