Yeah, me too - the seed sowing game that is. After you have murdered a few thousand innocent plants, you get a bit more insouciant about the enormous rates of attrition and it all starts to make sense why plants produce seeds in the millions. The best advice I can honestly offer is to save your own. For years, I only bought seeds from various merchants and fully accepted the high rate of failure as being down to my neglect (I am a slapdash gardener with a very short attention span) until I started saving and swapping my own whereupon almost overnight, the rates of success, even with tricksy plants, trebled. You might also consider joining one of the various plant societies such as the NCCPG (National campaign for conservation of plants group, I think) or the HPS (Hardy Plant Society - my choice for a mere £19 a year). For far less than membership of the RHS, you will have access to members seed lists - up to 25 varieties for free - more if you also make donations of seeds) and also, the HPS publishes a monthly and quarterly newsletter which is brilliant. I can hardly wait for this next listing in November as I joined just too late to make use of this years list.
Probably best to leave the iris in situ - iris germanica produces a rhizome rather than a bulb, on the surface of the soil, so should be visible enough for you to recognise them later in the year.