cclarry
Also Parkere is selling Pro DS for $100 on KVR
 
http://www.kvraudio.com/forum/viewtopic.php?f=43&t=447250&hilit=Fabfilter+Pro+C
 
Doesn't say it's sold so might want to PM him...

All sold unfortunately. Thanks for looking about for me Larry :)

I do what I can to help Wiz!

Your strategy is predicated on the presumption that you won't get the loyalty discounts buying all three at once. Better check to make sure that's true. It may be that discounts are automatically calculated based on the value of everything in your custom "bundle". In that case, it would make sense to buy them all at once AND use the 10% first-time-customer credit. It's worth posing the question to FF.
 
 

It will be less buying the first one on sale...
The first one always comes in at retail at FF...and the
others are based on what you own and/or are
buying.  I checked in my account...by adding 3
First was at retail...only the rest were discounted..

gswitz
If you are a teacher, you get a good discount.

No further strategy involved? Like buying one first?

bitflipper
Your strategy is predicated on the presumption that you won't get the loyalty discounts buying all three at once. Better check to make sure that's true. It may be that discounts are automatically calculated based on the value of everything in your custom "bundle". In that case, it would make sense to buy them all at once AND use the 10% first-time-customer credit. It's worth posing the question to FF. 

My experience with the FF site (but not as a first timer) is that discounts are automatically granted in a running total based on what is selected to purchase.
 
Here's another option you might consider - if you have just a little extra cash to spend wisely, then wait a month or two.  Historically, if memory serves, FF does a 25% bundle holidays sale every year.  Pick up the mixing bundle (six plug-ins including the three you named) for a bit less than $450.  You will not be sorry in the long run.  Every one of those six is a total winner.  I don't know if you can combine that with the 10% referral discount.  Maybe someone here can provide an authoritative answer to that one.

Historically FF does not allow using the referral discount on sale items. The referral discount is applied to retail prices.

I agree with dmbaer... the mixing bundle on black fri/holidays is by far your best move... in addition to the 25% off, Jrr and maybe other shops tack on additional discounts...I think 10-15% more... I have built my Fab inventory over time but looking back, the bundle is a way better move, especially now that Fab's discounting (just recently)...
 
The delay is just exquisite... I have a dozen and pretty much alway end up using timeless... The only thing I don't have is Saturn...love DS, Q2, C2, G and L... Have Volcano and their synth but don't really use them for the stuff I do...
 
Have a zillion plugs... Fab has obsoleted nearly all but Stealth, Spaces, and a couple more... could a bought Fab 5 times over if I knew what I do now...
 
You could also get the Mastering bundle and then buy DS separately, during the sale... again, JRR shop gave me the extra discount when I added DS last sale...
 
BTW, you can full on demo any of them for a month... might wanna selectively do so... should get you close to BF in November...  at least demo what you think you might not want, like Timeless (which you didn't list) so you can just go the mastering bundle if you don't feel it's "you"...

Gonna wait a year or so before jumping in. Still pretty much a presets guy, with some tweaking, somewhere between EZmix and Alloy/Ozone with T-RackS added in for good measure. Guess I'll be ready to play with the adults next year and get FF then.

gswitz
If you are a teacher, you get a good discount.

Them that can, do. Them that can't get a discount.