Dollar Tree to start accepting coupons 8/26, so here are a few things I've found for you...

I perused Dollar Tree, making a list of the brand name items they carry.  A few things I found to use coupons on are:

Advil

Advil Save $1/1 20ct+ (8/31/12) RP 5/20/12

Aleve

Aleve $1/1 20ct+ product excludes D (9/30/12) SS 6/24/12

Softsoap

SoftSoap Liquid Hand Soap, 8 oz+ .35 (9/1/12) SS 8/12/12

Colgate

Colgate Max Fresh, Total, Optic White or Sensitive Toothpaste, 4oz+ .75 (9/1/12) SS 8/12/12

Crest

Crest Toothpaste, 4oz+ or liquid gels excluding Cavity, Baking Soda or Tartar $0.75 (8/31/12) P&G 7/29/12

Aquafresh

http://www.aquafresh.com/Savings.aspx

Dial bar soap

Dial Liquid or Foaming Hand Soap or bar, 3pk+ .35 (9/8/12) RP 8/19/12

Hamburger Helper

Hamburger Helper $.75/3 home cooked skillet meal (9/8/12) SS 7/15/12
Hamburger Helper $0.75/3 (9/29/12) GENERAL MILLS 8/5/12

Superpretzel

http://www.redplum.com/pages/viewoffer.aspx?offerid=88882&frm=0&pl=true?parents=312

Kraft Mayo

Kraft Mayo or Miracle Whip Dressing, any .25 (9/16/12) SS 8/19/12

Spam

Spam Product, any 12 oz. $1 (10/1/12) SS 8/5/12

Betty Crocker cookie mix

http://www.bettycrocker.com/coupons-promotions/coupons/coupons

Irish Spring bar soap

Irish Spring Multi-bar pack or Body Wash .50 (9/1/12) SS 8/12/12

Goya foods

http://www.goya.com/english/coupons.html

Soft Scrub Cleanser$1/1 Soft Scrub Product (RP 8/19/12)

Welch’s Fruit Snacks 

$0.50/1 Welch’s Fruit Snacks