• iffer price,
• kffer price,
• lffer price,
• pffer price,
• 0ffer price,
• 9ffer price,
• odfer price,
• ocfer price,
• ovfer price,
• ogfer price,
• otfer price,
• orfer price,
• ofder price,
• ofcer price,
• ofver price,
• ofger price,
• ofter price,
• ofrer price,
• offwr price,
• offsr price

The adjective form of "offer price" would be "offered".

The plural form of "offer price" is "offer prices".

The singular form of the word "offer price" is "offer price". The word does not change in its singular form.