some tweaks for product offers.

src/main/java/group/goforward/ballistic/controllers/ProductController.java

@@ -3,6 +3,7 @@ package group.goforward.ballistic.controllers;
 import group.goforward.ballistic.model.Product;
 import group.goforward.ballistic.model.ProductOffer;
 import group.goforward.ballistic.repos.ProductOfferRepository;
+import group.goforward.ballistic.web.dto.ProductOfferDto;
 import group.goforward.ballistic.repos.ProductRepository;
 import group.goforward.ballistic.web.dto.ProductSummaryDto;
 import group.goforward.ballistic.web.mapper.ProductMapper;
@@ -72,6 +73,25 @@ public class ProductController {
                 .toList();
     }
     
+    @GetMapping("/{id}/offers")
+    public List<ProductOfferDto> getOffersForProduct(@PathVariable("id") Integer productId) {
+        List<ProductOffer> offers = productOfferRepository.findByProductId(productId);
+
+        return offers.stream()
+            .map(offer -> {
+                ProductOfferDto dto = new ProductOfferDto();
+                dto.setId(offer.getId().toString());
+                dto.setMerchantName(offer.getMerchant().getName());
+                dto.setPrice(offer.getEffectivePrice());
+                dto.setOriginalPrice(offer.getOriginalPrice());
+                dto.setInStock(Boolean.TRUE.equals(offer.getInStock()));
+                dto.setBuyUrl(offer.getBuyUrl());
+                dto.setLastUpdated(offer.getLastSeenAt());
+                return dto;
+            })
+            .toList();
+    }
+
     private ProductOffer pickBestOffer(List<ProductOffer> offers) {
         if (offers == null || offers.isEmpty()) {
             return null;

src/main/java/group/goforward/ballistic/repos/ProductOfferRepository.java

@@ -8,5 +8,8 @@ import java.util.List;
 
 public interface ProductOfferRepository extends JpaRepository<ProductOffer, Integer> {
 
+    List<ProductOffer> findByProductId(Integer productId);
+
+    // Used by the /api/products/gunbuilder endpoint
     List<ProductOffer> findByProductIdIn(Collection<Integer> productIds);
 }

src/main/java/group/goforward/ballistic/web/dto/ProductOfferDto.java

@@ -0,0 +1,70 @@
+package group.goforward.ballistic.web.dto;
+
+import java.math.BigDecimal;
+import java.time.OffsetDateTime;
+
+public class ProductOfferDto {
+    private String id;
+    private String merchantName;
+    private BigDecimal price;
+    private BigDecimal originalPrice;
+    private boolean inStock;
+    private String buyUrl;
+    private OffsetDateTime lastUpdated;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getMerchantName() {
+        return merchantName;
+    }
+
+    public void setMerchantName(String merchantName) {
+        this.merchantName = merchantName;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public BigDecimal getOriginalPrice() {
+        return originalPrice;
+    }
+
+    public void setOriginalPrice(BigDecimal originalPrice) {
+        this.originalPrice = originalPrice;
+    }
+
+    public boolean isInStock() {
+        return inStock;
+    }
+
+    public void setInStock(boolean inStock) {
+        this.inStock = inStock;
+    }
+
+    public String getBuyUrl() {
+        return buyUrl;
+    }
+
+    public void setBuyUrl(String buyUrl) {
+        this.buyUrl = buyUrl;
+    }
+
+    public OffsetDateTime getLastUpdated() {
+        return lastUpdated;
+    }
+
+    public void setLastUpdated(OffsetDateTime lastUpdated) {
+        this.lastUpdated = lastUpdated;
+    }
+}