I too ordered from getbetterlife, I emailed them initially and they said they hard a large amount of stock. I was hesitant to order from dealextreme even though I love the site because they were sold out and I knew that with the new rush of orders, by the time I received mine Rigol might have firmware blocked the mod. I also notified dealextreme of the price difference, as getbetterlife's unit is a bit cheaper...hence the price change.
For anyone interested, my tracking number given seems to be accurate and the site doesn't appear to be a scam. While little is said about it on resellerratings the two reviews are positive.
I'd recommend it for anyone who orders from DX and finds that they are now out of stock, potentially due to Rigol intervention.
Hope this helps