thanks guys do they put them on sale or is it better to buy from OPG or another store to get discounts or is 600.00 the best you have seen the kit?
Yes, they do have sales! Their big one is in Dec/January, usually about 20% off.
They did have a pre-summer sale last year May 16-21 2012, also 20% off. I have no idea if it will be repeated this year.
Keep an eye on their website and Facebook page for sale announcements.
Their products are sold through other vendors, so you may be able to get them on sale elsewhere.