You may know of
Vert Shock analogue solutions.com for Red Square and Vostok semi modular synths. This company has an extremely interesting variety of synthesizer equipment. They have their own line that they produce called Concussor series. They have some really interesting percussion models to give you the ancient drum sounds. You will be quite surprised to see the Roland TR-808 cowbell module here. They also carry the standard subtractive modules along with the sequencing and utility ones.
We can't leave out cwejman.net. They became known for their "S" series hybrid semi modular rack synthesizers.You can be creative with items from this company by building your own Cwejman modules. They have just come out with their own like of Eurorack format modules. Although new there have been reports that says they are just as good as the previous ones made by this company. Unfortunately the price hasn't changed. If you decide to build your own module then check out the other outboard-style modules and two different compressors. Don't pass by without checking out the dual oscillator module that actually has a built in ring modulator.
http://energizegreenssupplementreview.com/robin-halls-piano-for-all-review/