Lack of availability and the price premium for organic food are stopping fewer U.S. households from purchasing organic items than a year ago, according to an Organic Trade Association study.

The U.S. Families’ Organic Attitudes & Beliefs 2014 Tracking Study polled 1,200 households with at least one child under age 18. Fifty-one percent of parents surveyed said the cost of organic products was a key factor in limiting their organic purchases, a sharp drop from 2013, when 62% said organic items were at times too expensive.

In addition, the study found the lack of availability of organic products was cited by just 12% of households as a reason for not buying organic, down from 21% in 2013 who described availability as a barrier, according to a news release.

The study found that families who include organic products on their grocery list on a regular basis spend an average of $125 a week at the grocery store, compared to $110 a week for those who don’t buy organic, according to the release. The poll found close to 10% of consumers buy only organic food, while 47% of those polled said that half or more of their weekly grocery purchases are organic.

Supermarkets are the source of organic food for 70% of households polled, according to the release. The association partnered with KIWI Magazine to conduct the study in late February and early March, according to the release.