My personal advice would be to take SCWCD first and tackle the SCBCD later. But considering the fact, that there aren't any books for SCWCD now, you can take SCBCD first followed by SCWCD when the books becomes available.
Regarding the price, if you are an existing customer, you will get 20% discount for a simulator. If you buy 2 simulators at the same time,you would get 1 simulator of your choice absolutely free. Offcourse, you may get the SCWCD 1.4 simulator for free if you win it in this promotion