I live in a country that doesn't have as good discounts as in the USA, but with better discounts than in Europe.
Of the scents you cited, this is what I paid for them
A*men - $40 gift set with 50ml bottle
YSL M7 - $80
YSL Kouros/Body Kouros - $35 100ml bottle
L'Instant de Guerlain EDT - $42 100ml bottle
Gucci Envy - $50 100ml
Burberry London - $30 50ml
l'eau d'Issey Issey Miyake - $50 125ml
Chrome Azzaro - $17 100ml
Hanae Mori HM - $60 100ml
And I subsequently could have gotten some of them cheaper. And I've gotten classics like Egoiste, Equipage and Blenheim's Bouquet for $35.
All I'm saying is that if you're on a budget, it pays to scrounge around bargain bins, closing down sales and internet sites, looking for good scents that have fallen on hard times. I have a heap of $20, $10 and $5 bottles of scents that I quite like or like a lot - and this is the price range that I paid for half of my niche scents. Read the reviews here at Basenotes and at Fragrantica (they're less finicky over there about where a scent is artistic or synthetic in their rating) and pick up some high quality designer scents at heavily discounted prices. Just avoid the budget scents that were made cheap to be sold cheap - because they smell cheap.