You want to buy from a supplier that can provide good advice, offers a wide variety of products, performs quality installation work, promptly makes things right if things go wrong and charges a good price.
All advertisements for the sale or rental of dwelling units published in The Washington Post are subject to the federal Fair Housing Act, which makes it illegal to advertise "any preference, limitation, or discrimination because of race, color, religion, sex, handicap, familial status or national origin, or intention to make such preference, limitation, or discrimination." State law forbids discrimination based on factors in addition to those protected under federal law.
The Washington Post will not knowingly accept any advertising for real estate which is in violation of the law. All persons are hereby informed that all dwellings advertised are available on an equal opportunity basis.