If you're new to Melda plugins here are a few things you should probably know about their pricing (correct me if I'm wrong):
If you upgrade from a) individual plugins to a bundle or b) from one bundle to bigger one (say, from Mixing to Complete), they reimburse you 70% of what you have actually paid for a) the invidivual plugins in the bundle or b) the smaller bundle.
You will not be reimbursed in any way if you crossgrade to a bundle on a same "level", like from Mixing to Mastering.
If you have bought a plugin or a bundle from a 3rd party, they assume you have paid 50% of the retail price and reimburse 70% of that, ie. 35% of the retail price.
If you want to sell your Melda plugins, they charge you a whopping 20% of the retail price as a transfer fee. Want to sell your MMixingFXBundle that currently goes for €599? Please pay ~€120 in transfer fees.
So if you buy MMixingFXBundle during the Black Friday sale for €300 and later want to upgrade to MComplete, you get a discount of €300 * 0.7 = €210. On the other hand, if you had bought the same bundle from someone else for less than €210, you would still get that €210 discount and would actually be making some profit.
I've been making a list and I've noticed that buying individual plugins quickly adds up to the point where they equal or exceed the cost of a bundle. I'm probably interested in only 7 plugins in the MCreativeFXBundle (currently €599), but individually they cost €613. Same thing with the MMixingFXBundle (currently also €599) where the six plugins I'm interested in cost €614.
I'm not saying Melda is any better or worse than other developers when it comes to pricing, but trying to figure out the most cost-effective purchase plan is giving me a serious analysis paralysis.