After a few weeks online, the prices for PF elements suddenly arose significantly, at LEGO S@H across all Europe.
Those prices were in fact surprisingly reasonable when these products became available as individual parts, but now that's all gone...
Unfortunately, I didn't took note of the original prices to compare now (who would imagine this?), but there is always someone who does...
By reading also a post about this issue at Brickset, I found someone who did it and posted them in a comment:
- 8881 - Battery Box from 4,99€ to 7,49€ (50% inc.)
- 8882 - XL Motor from 6,99€ to 11,49€ (64% inc.)
- 8883 - M Motor from 5,99€ to 8,49€ (42% inc.)
- 8884 - IR Receiver from 10,99€ to 16,49€ (50% inc.)
- 8885 - IR Remote from 6,99€ to 10,49€ (67% inc.)
- 8886 - Extension Wire from 2,99€ to 3,49€ (17% inc.)*
* For this one, I remember the price was 2,95€ for my country, because I've ordered some ;)