A few sets from various themes from LEGO Ideas, to Harry Potter to Star Wars, are at a decent discounted price on Amazon that may the right price for you if you do not already have them in your collection.
LEGO Star Wars BB-8 75187 | 1106 Pcs | $58.33 USD (42% Discount)
LEGO Harry Potter Hogwarts Express 75955 | 801 Pieces | $63.99 USD (20% Discount)
LEGO Ideas 21315 Pop-up Book Building Kit | 859 Pieces | $55.99 USD (20% Discount)
LEGO Ideas Women of NASA 21312 | 231 Pieces | $17.99 USD (28% Discount)