You can start with cheaper ones first, and then set a goal, e.g. 35 items per week. As the items get more and more expensive, remember that your goal is flexible. So change your goal!
Example:
Week 1: 35 items.
Week 2: 32 items.
Week 3: 30 items.
Week 4: 27 items.
etc.
And if you didn't keep up to your set goal (e.g. you bought 33 items on the 1st week) don't feel too bad. 35 can just be a goal, and even if you don't get it, at least you got 33! Don't be too strict on yourself.